The H Pylori is a breath test which is performed to determine the presence of bacterium Helicobacter pylori, which causes inflammation, ulcers and atrophy of the stomach.
 
Why should I get a H Pylori test? 
If you currently have a stomach or duodenal ulcer. If you had a stomach or duodenal ulcer in the past, and were never tested for H pylori. After treatment for H pylori infection, to make sure there are no more of these bacteria.